hi,i am 33 yrs old ,i am trying for a baby last 9 month,married for 7 yrs.all of my reports is normal said my gynecologist .now she give me letrol-2.5,2 tabs for 5 days,i also in take metformin .folison.letrol taken for 2 month,today is the 4th day in first cycle as she prescribed.what is the meaning of unexpected infertility ?